Browser-based utilities for everyday development. No signup, no install, no tracking. Just tools that work.
Every developer has moments where they need to quickly format JSON, decode a JWT, generate a UUID, or test a regex. Instead of googling each time, here's a collection of tools that handle all of it in one place.
Every tool runs entirely in your browser. Your data never leaves your machine. And they're all free, forever.
Paste messy JSON, get perfectly formatted output with syntax highlighting. Validates structure and shows errors inline. Also available via API: POST /api/json/format
Encode and decode Base64 strings instantly. Supports text and binary data. API: POST /api/base64/encode
Encode special characters for URLs or decode URL-encoded strings. Handles nested encoding.
Convert special characters to HTML entities and back. Essential for sanitizing user input.
Count words, characters, sentences, paragraphs. Calculate reading time. Analyze text density and keyword frequency.
Compare two text blocks side by side. Highlights additions, deletions, and changes with color coding.
Generate placeholder text by paragraph, sentence, or word count. Clean output, easy to copy.
Paste a JWT token and instantly see the decoded header, payload, and signature. Validates expiration and structure.
Generate cryptographically strong passwords. Customize length, character sets, and format. API: GET /api/password
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes. Useful for file verification and password hashing demos. API: POST /api/hash
Test regular expressions against sample text with real-time match highlighting. Shows capture groups and flags.
Build cron expressions visually. See next run times and human-readable descriptions. No more cron syntax guessing.
Convert between Unix timestamps and human-readable dates. Supports seconds and milliseconds.
Write Markdown with live preview. Supports GFM, tables, and code blocks. Export to HTML.
Generate QR codes for any text, URL, or data. Customize size and download as PNG. API: GET /api/qr?text=hello
Pick colors visually or convert between HEX, RGB, HSL formats. Copy values with one click.
Combine multiple PDF files into one. Drag to reorder pages. All processing in your browser.
Get a unique URL to test webhook integrations. See incoming requests in real time with full headers and body.
Every tool above is also available as a REST API endpoint. Get a free API key (100 requests/day) or upgrade to Pro for 10,000 requests/day.
100+ endpoints. JSON, PDF, QR, hash, UUID, and more. Free tier: 100 requests/day.
Get Free API KeyAll tools are open source and built with FastAPI + vanilla JavaScript. No frameworks, no trackers, no cookies. Just tools that work.
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